diff --git a/compiler/load/src/file.rs b/compiler/load/src/file.rs
index 01a743cc47..19b0acba38 100644
--- a/compiler/load/src/file.rs
+++ b/compiler/load/src/file.rs
@@ -2099,8 +2099,29 @@ fn parse_header<'a>(
                 }
                 To::NewPackage(package_or_path) => match package_or_path {
                     PackageOrPath::Package(_, _) => panic!("TODO implement packages"),
-                    PackageOrPath::Path(StrLiteral::PlainLine(_package)) => {
-                        panic!("TODO implement plain line package path")
+                    PackageOrPath::Path(StrLiteral::PlainLine(package)) => {
+                        // check whether we can find a Pkg-Config.roc file
+                        let mut pkg_config_roc = pkg_config_dir.clone();
+                        pkg_config_roc.push(package);
+                        pkg_config_roc.push(PKG_CONFIG_FILE_NAME);
+                        pkg_config_roc.set_extension(ROC_FILE_EXTENSION);
+
+                        if pkg_config_roc.as_path().exists() {
+                            let load_pkg_config_msg = load_pkg_config(
+                                arena,
+                                &pkg_config_dir,
+                                module_ids,
+                                ident_ids_by_module,
+                                mode,
+                            )?;
+
+                            Ok((
+                                module_id,
+                                Msg::Many(vec![app_module_header_msg, load_pkg_config_msg]),
+                            ))
+                        } else {
+                            Ok((module_id, app_module_header_msg))
+                        }
                     }
                     PackageOrPath::Path(StrLiteral::Block(_)) => {
                         panic!("TODO implement block package path")